ADC-305 Datasheet, PDF (1/6 Pages) List of Unclassifed Manufacturers – 8-Bit, 20MHz CMOS A/D Converters

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ADC-305
8-Bit, 20MHz CMOS A/D Converters
OBSOLE^PROT^DUE^{CT OV}P^ERR^VIEWODUCT
DATEL's ADC-305 is an 8-bit, 20MHz sam-
sipation (60mW typical) and a wide 18MHz (–1dB)
Contact Factoplrinyg, CfMoOrS,Rsuebrpanlgaincge(twmo-peasns)tA/MD coondveretelr. input signal bandwidth.
It processes signals at speeds comparable to a full The ADC-305-1 is packaged in 400 mil 24-pin DIP
flash converter by using a sub-ranging conversion and the ADC-305-3 in 300 mil 24-pin SOP.
technique with multiple comparator blocks, each
Other features are CMOS compatible input logic,
containing a sample and hold amplifier.
3-state TTL compatible output logic, +5V single
The ADC-305 features CMOS low power dis- power operation, self bias mode and low cost.
FEATURES
■ _{8-bit resolution, 20MHz min. sampling rate}
■ _{±½LSB max. differential nonlinearity error}
■ _{18MHz input signal bandwidth}
■ _{Subranging, S&H enclosed}
■ _{+5V single power, low 85mW max. dissipation}
■ _{CMOS compatible logic input}
■ _{3-State TTL compatible output}
INPUT/OUTPUT CONNECTIONS
Pin
FUNCTION
Pin
FUNCTION
1
OUTPUT ENABLE (OE)
24
DGND
2
DGND
23
REF. BOTTOM (VRB)
3
BIT 8 (LSB)
22
SELF BIAS 1 (VRBS)
4
BIT 7
21
AGND
5
BIT 6
20
AGND
6
BIT 5
19
ANALOG INPUT (VIN)
7
BIT 4
18
+AVS (+5V)
8
BIT 3
17 REFERENCE TOP (VRT)
9
BIT 2
16
SELF BIAS 2 (VRTS)
10
BIT 1 (MSB)
15
+AVS (+5V)
11
+DVS (+5V)
14
+AVS (+5V)
12
CLOCK INPUT (A/D CLK)
13
+DVS (+5V)
Both the ADC-305-1 and the ADC-305-3 have the same pin assignment.
OUTPUT ENABLE 1
DGND 2
BIT 8 (LSB) 3
BIT 7 4
BIT 6 5
BIT 5 6
BIT 4 7
BIT 3 8
BIT 2 9
BIT 1 (MSB) 10
+DVS 11
A/D CLK 12
Ḥ
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REFERENCE
VOLTAGE
LOWER
DATA
LATCHES
LOWER
ENCODER
(4 BIT)
B BLOCK
COMPARATORS
WITH S/H (4 BIT)
UPPER
DATA
LATCHES
LOWER
ENCODER
(4 BIT)
UPPER
ENCODER
(4 BIT)
CLOCK
GENERATOR
A BLOCK
COMPARATORS
WITH S/H (4 BIT)
UPPER
COMPARATORS
WITH S/H (4 BIT)
Figure 1. Functional Block Diagram
24 DGND
23 VRB
22 VRBS
21 AGND
20 AGND
19 VIN
18 +AVS
17 VRT
16 VRTS
15 +AVS
14 +AVS
13 +DVS
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MDA_ADC-305.B01 Page 1 of 6